The recent tuned and python update fixed the bug that tuned was waking up the system each 50 milliseconds. As a consequence the tuned started to wake the system only after 10 seconds. This improved the power consumption but made the responsiveness of tuned worse.
Tuned could react to commands in up to 10 seconds.
The main thread code was slightly reworked and the interval lowered to 1 second.
Tuned can now react to commands in up to 1 second with still slightly low overhead. In case you need even lower overhead and you don't mind to have longer response times, you can fine tune the sleep_interval settings in the global Tuned configuration file (/etc/tuned/tuned-main.conf). For details, see the manual page.